Question
a.
Hashed keys do not work well with fields that increase monotonically like ObjectId values or timestamps
b.
If you shard an empty collection using a hashed shard key, MongoDB will automatically create and migrate chunks so that each shard has two chunks
c.
Hashed keys work well with ObjectId values only
d.
All of the mentioned
Posted under Sharding Concepts and Sharded Cluster MongoDB
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